You can try the following commands
it will completely delete the pycharm with its preferences from ubuntu.
rm -fv /usr/local/bin/charm
rm -rfv ~/Library/Preferences/PyCharm?0
rm -rfv ~/Library/Caches/PyCharm?0
rm -rfv ~/Library/Application\ Support/PyCharm?0
rm -rfv ~/Library/Logs/PyCharm?0